"I turned the face manipulation code into a runnable binary, which I intended to wrap with a Slack bot." So you turned your Python program into a single, statically linked executable? May I ask how you did that?
I think the author's application was written in Go which as I understand it does static linking by default.
However, creating standalone executables from python is called freezing and can be done using various tools[0].
0: http://docs.python-guide.org/en/latest/shipping/freezing/